"Scrap your boilerplate" --- Generic programming in Haskell
See http://www.cs.uu.nl/wiki/GenericProgramming/SYB. The present module
contains thirteen Data instances which are considered dubious (either
because the types are abstract or just not meant to be traversed).
Instances in this module might change or disappear in future releases
of this package.

(This module does not export anything. It really just defines instances.)